What is the best free AI chatbot?

Could you elaborate on which free AI chatbot stands out as the most effective? With the plethora of options available, it's crucial to identify one that offers not just basic conversational capabilities but also advanced features such as natural language processing, context-aware responses, and the ability to handle a wide range of topics. Additionally, ease of integration, user-friendliness, and scalability for potential future growth are all important considerations. Could you share your insights on which free AI chatbot ticks all these boxes and provides a compelling user experience?